docs: def length_of_overlap(first_start, first_end, second_start, second_end):
      """
      Find the length of the overlapping part of two segments.
  
      Args:
          first_start (float): Start of the first segment.
          first_end (float): End of the first segment.
          second_start (float): Start of the second segment.
          second_end (float): End of the second segment.
  
      Return:
          float: The amount of overlap or 0 if they don't overlap at all.
      """
      if first_end <= second_start or first_start >= second_end:
          return 0.0
  
      if first_start < second_start:
          if first_end < second_end:
              return abs(first_end - second_start)
          else:
              return abs(second_end - second_start)
  
      if first_start > second_start:
          if first_end > second_end:
              return abs(second_end - first_start)
          else:
              return abs(first_end - first_start)